CN102912159B - Intermetallic compound ultrafine particle reinforced metal-based composite material and preparation method thereof - Google Patents

Intermetallic compound ultrafine particle reinforced metal-based composite material and preparation method thereof Download PDF

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CN102912159B
CN102912159B CN201210414648.4A CN201210414648A CN102912159B CN 102912159 B CN102912159 B CN 102912159B CN 201210414648 A CN201210414648 A CN 201210414648A CN 102912159 B CN102912159 B CN 102912159B
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intermetallic compound
yal
alloy
matrix
composite material
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CN102912159A (en
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张清清
吴国清
刘毕胜
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Jiangsu Limei Air Material Technology Co ltd
Beihang University
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JIANGSU LIMEI AVIATION MATERIAL TECHNOLOGY CO LTD
Beihang University
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Priority to US14/375,034 priority patent/US9869006B2/en
Priority to PCT/CN2013/076529 priority patent/WO2014063492A1/en
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    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/026—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0408—Light metal alloys
    • C22C1/0416—Aluminium-based alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/047—Making non-ferrous alloys by powder metallurgy comprising intermetallic compounds
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/10—Alloys containing non-metals
    • C22C1/1084—Alloys containing non-metals by mechanical alloying (blending, milling)
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C24/00—Alloys based on an alkali or an alkaline earth metal

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Abstract

The invention discloses an intermetallic compound ultrafine particle reinforced metal-based composite material and a preparation method of the intermetallic compound ultrafine particle reinforced metal-based composite material. The intermetallic compound ultrafine particle has a grain size of 0.01 to 5 micrometers. The preparation method comprises steps as follows: mixing reinforced particles with metal additives, and processing by ball milling, so as to obtain composite powder; pre-compressing the composite powder to obtain pre-compressed blocks; adding the pre-compressed blocks into basal alloy melt to melt together; and then preparing in an agitating and melting system to obtain the intermetallic compound ultrafine particle reinforced metal-based composite material, wherein the reinforced particles are of 1 to 30% in mass percentage. By adopting the intermetallic compound ultrafine particle reinforced metal-based composite material, a dispersing performance, interface bonding and interface performances of the reinforced particles are obviously improved; and compared with a common particle reinforced composite material, the composite material disclosed by the invention is higher in strength, and keeps high plasticity.

Description

A kind of intermetallic compound ultrafine grain reinforced metallic matrix composite material and preparation method thereof
Technical field
The invention belongs to matrix material and preparing technical field thereof, relate to the preparation method that a kind of intermetallic compound particle strengthens metal-base composites, particularly relate to the metal-base composites that a kind of intermetallic compound ultrafine grain through composite ball-milling surface modification strengthens.
Background technology
Magnesium lithium-base alloy is because having ultralow density (1.30g/cm 3~ 1.60g/cm 3), the penetrativity of higher specific tenacity and specific rigidity, excellent damping performance and anti-high energy particle, as structural metallic material the lightest in nontoxic metal material, have broad application prospects in the field such as aerospace, communications and transportation.In dibasic magnesium lithium alloy, along with the increase containing Li amount, there is α (hcp) → alpha+beta → β (bcc) and change (as shown in Figure 1) in alloy structure, the plastic deformation ability of alloy is significantly improved, its unit elongation can reach more than 40%, but because alloy strength is on the low side, creep-resistant property is poor, limit magnesium lithium-base alloy range of application.
Complex intensifying is then for the mechanical property improving magnesium lithium-base alloy further provides effective way.Compared with magnesium lithium-base alloy, matrix material not only remains the conduction of matrix alloy, heat conduction and excellent hot and cold processing characteristics, and integrate low density, high specific stiffness, high specific strength, good wear resistance, resistance to elevated temperatures, damping performance and good damping capacity and capability of electromagnetic shielding, one of focus becoming investigation of materials.As other matrix material, the enhancement method of Mg Li composites also mainly contains fiber reinforcement, particle reinforce and whisker reinforcement three kinds of modes, and reinforcement composition mainly contains SiC, B 4c, Al 2o 3, TiC, B etc.These reinforcements both can adopt and add strengthening separately with particle, fiber or whisker form, also can adopt mixed form (such as SiC particle/Al 2o 3whisker mixes) add strengthening, and improve the mechanical property of magnesium lithium-base alloy to some extent.But stupalith complex intensifying also brings the plasticity of material and the problem of toughness major injury.From result of study, magnesium lithium-base alloy and ceramic reinforcing material have good wettability and chemical compatibility performance can form ideal compound phase interface, so the fragility of the plasticity of material and significantly decline and the ceramic enhancement phase of toughness is closely related.Therefore, choose the material that not only there is enhancement but also possess certain microstrain coordinative role as Mg Li composites strongthener, the over-all properties improving material is had great significance.
Intermetallic compound is because having the characteristic of metal, as shown metalluster, metallic conductivity and thermal conductivity etc., thus select intermetallic compound particle as the wild phase of Mg Li composites, more easily obtain, with magnesium lithium matrix, there is the adaptive interface such as good wettability, chemical compatibility.And the comparatively high specific strength that intermetallic compound has and specific rigidity, and the operation at high temperature between alloy and pottery, become the effective wild phase of alloy.In addition, compared with ceramic particle, intermetallic compound has relative plasticity, and thus it is while raising matrix alloy intensity, and the Plastic Damage of alloy matrix is less than the damage adopting ceramic enhancement phase to cause.The above provides the foundation for formation intermetallic compound particle enhancing Mg Li composites has good over-all properties.
Application number is propose one in the patent documentation of 200910082581.7 containing compound ultrafine grain reinforced metallic matrix composite material between rare earth elemental metals, this matrix material adopts the intermetallic compound particle strengthen magnesium lithium alloy of 0.1 ~ 3 μm, its plasticity is kept preferably, and its intensity improvement value is 20% ~ 40%.Although improve the comprehensive mechanical property of material to a certain extent, because particle size is less, reinforcement is more easily reunited, interface cohesion still can not meet the demand to intensity simultaneously, also have a certain distance apart from ultralight, high-strength target, the comprehensive mechanical property of Mg Li composites needs to improve further.
Summary of the invention
The invention provides a kind of intermetallic compound ultrafine grain reinforced metallic matrix composite material and preparation method thereof, described preparation method comprises the step of composite ball-milling, powder precompressed and melting, solve the agglomeration traits that nanoparticle-reinforced metal matrix composite material produces in preparation process, be conducive to the raising of composite materials property and keep stable.
In described preparation method, reinforcement particle and metallic additions are carried out composite ball-milling, realize the surface modification of reinforcement particle; The composite powder obtained after composite ball-milling is carried out pre-briquetting process, forms the pre-briquetting of composite powder.Then be metal-base composites 1% ~ 30% for parameter with reinforcement granular mass mark, intermetallic compound particle reinforcement after introducing surface modification by the mode of the pre-briquetting of composite powder in matrix alloy liquation, in mechanical stirring and the auxiliary lower melting of ultrasonic agitation, prepare the metal-base composites that intermetallic compound ultrafine grain strengthens.
The preparation method of intermetallic compound ultrafine grain reinforced metallic matrix composite material provided by the invention, take intermetallic compound ultrafine grain as reinforcement, the grain diameter choosing reinforcement is 0.01 μm ~ 5 μm, massfraction is 1% ~ 30%, preferably, the median size of reinforcement particle is 0.01 ~ 0.5 μm, and massfraction is 1% ~ 20%.Concrete preparation method's step is as follows:
The first step, by reinforcement particle and metallic additions mixing, as mixed powder, carries out composite ball-milling and forms composite powder on planetary ball mill by mixed powder.
Described metallic additions can be magnesium powder or aluminium powder, can be scrap metal or the metal-powder of magnesium base, also can be aluminium base scrap metal or metal-powder.Because Mg-Li alloy is more oxidized, therefore its powder is not suitable for as interpolation powder, therefore when selecting Mg-Li alloy as matrix, adopts Mg powder as metallic additions.In the quality of metallic additions and the 3rd step, the quality sum of melting matrix alloy constitutes the matrix total mass of matrix material.The mass ratio of metallic additions and reinforcement particle is 1:3 to 3:1.
Second step, the composite powder obtained through composite ball-milling carries out pre-compacted, obtains the pre-briquetting of composite powder.Can prevent ultrafine powder reinforcement from the process adding matrix alloy, introducing too much gaseous impurities and burning like this.The condition of pre-compacted is pressure 1MPa ~ 20MPa, time 10min.
3rd step, according to the component requirements of matrix alloy in matrix material, element ratio shared by deduction metallic additions, proportioning is carried out to surplus element and then carries out melting, then in matrix alloy liquation, the pre-briquetting of described composite powder is added, continue melting, finally obtain intermetallic compound ultrafine grain reinforced metallic matrix composite material, in described intermetallic compound ultrafine grain reinforced metallic matrix composite material, reinforcement granular mass mark is 1% ~ 30%.The auxiliary of mechanical stirring and ultrasonic agitation is adopted in fusion process.
Described reinforcement can be transition group or rare earth intermetallic compound, as YAl 2or CeAl 2intermetallic compound ultrafine grain.
Described matrix alloy adopts Magnuminium or aluminum base alloy, and Magnuminium can for the magnesium alloy containing lithium be as magnesium lithium-base alloy, and its lithium content is 0.1wt% ~ 40wt%.Described aluminum base alloy can for the aluminium alloy containing lithium be as lithium-aluminium alloy, and its lithium content is 0.1wt% ~ 15wt%.
Present invention utilizes the high specific strength that intermetallic compound has, the characteristics such as the dimensional effect of specific rigidity and ultra-fine grain, prepare Novel super-thin reinforced particulate, for reinforced alloys matrix, make use of simultaneously intermetallic compound with metallic bond and the characteristic of covalent linkage, by the composite ball-milling with metallic additions (states of powder or bits), mechanical stirring and ultrasonic agitation auxiliary under, realize reinforcement particle dispersion, the improvement of interface cohesion and interfacial property, finally prepare homogeneous microstructure, what have good interface state contains compound ultrafine grain reinforced metallic matrix composite material between rare earth elemental metals.Due to the raising of matrix material homogeneity and the change of strengthening mechanism, intermetallic compound ultrafine grain reinforced metallic matrix composite material is largely increased in intensity, strengthen metal-base composites, and its plasticity is well kept far above plain particles.
The invention has the advantages that:
1, by composite ball-milling technique, surface modification is carried out to intermetallic compound particle, both improved the surfactivity of reinforcement particle, promote soaking between reinforcement particle and matrix, improve again the dispersiveness of reinforcement particle in coated mode.
2, submicron and nano-particle reinforcement body different from the strengthening mechanism that stock size reinforcement particle brings, the dimensional effect of ultra-fine reinforcement particle makes the performance of matrix material obtain improving more significantly.
3, the powder after composite ball-milling is pressed into the pre-briquetting of composite powder in advance, in the mode of pre-briquetting in matrix fusion process, intermetallic compound particle is incorporated in metallic matrix, metallic additions takes the lead in being melted subsequently, thus reinforcement particle is scatter preferably, improve reliability and the security of fusion process preferably simultaneously.
4, compared to existing technology of preparing, through surface modification and precompressed, the intensity of matrix material prepared by the new melting technology of mechanical stirring and ultrasonic wave added and plasticity obtain effective raising all simultaneously.
The tensile strength of the matrix material 5, adopting preparation method provided by the invention to prepare improves 50% ~ 250% compared to matrix alloy, and unit elongation is down to 7% ~ 20%, and plasticity is better kept.
Accompanying drawing explanation
Fig. 1 is existing Binary Mg Li Alloy phasor;
Fig. 2 is intermetallic compound ultrafine grain reinforced metallic matrix composite material preparation method schema provided by the invention;
Fig. 3 is composite material interface feature image prepared by the present invention;
Fig. 4 is matrix material displaing micro tissue topography picture prepared by the present invention;
Fig. 5 is YAl in preparation process of the present invention 2after/Mg composite ball-milling, granule-morphology TEM schemes.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
The invention provides the preparation method of the metal-base composites that a kind of intermetallic compound ultrafine grain strengthens, preparation method's flow process is as shown in Figure 2, specific as follows:
(1) reinforcement particle and metallic additions are mixed to form mixed powder, mixed powder is carried out composite ball-milling on planetary ball mill, form composite powder.Described reinforcement particle is intermetallic compound reinforcement particle, and particle diameter is 0.01 μm ~ 5 μm, and described metallic additions can be prepared from by matrix alloy, also can be pure metal bits or the powder such as magnesium powder, aluminium powder.Described intermetallic compound reinforcement particle can be YAl 2or CeAl 2the transition group such as intermetallic compound or rare earth intermetallic compound.
(2) composite powder is by pre-compacted under 1MPa ~ 20MPa condition, obtains the pre-briquetting of composite powder.Described pre-compacted can prevent from introducing too much gaseous impurities and burning in ultrafine powder adition process.
(3) the pre-briquetting of composite powder joins in matrix liquation in matrix component fusion process, and by mechanical stirring and ultrasonic agitation, adopts argon shield in fusion process, prepares metal-base composites.The metallic element existed in metallic additions is considered in matrix element proportioning process, according to the component requirements of matrix alloy in matrix material, element ratio shared by deduction metallic additions, proportioning is carried out to surplus element and then carries out melting, then in matrix liquation, add pre-briquetting, in the metal-base composites prepared, the mass percent of reinforcement is 1% ~ 30%.Described mechanical stirring and ultrasonic agitation can realize, to effective dispersion of ultra-fine grain, optimizing interface cohesion simultaneously, improve the comprehensive mechanical property of matrix material.
Described matrix is Magnuminium or aluminum base alloy.
By the metal-base composites that aforesaid method prepares, reinforcement grain diameter is 0.01 μm ~ 5 μm, massfraction is 1% ~ 30%, in preparation process, modified ultra-fine grain reinforcement is incorporated in matrix liquation in the mode of the pre-briquetting of composite powder, and the metallic additions in fusion process in the pre-briquetting of composite powder can preferentially melt, and makes reinforcement particle obtain good dispersion effect.Interface is carried out to the metal-base composites of above-mentioned preparation and performance analysis known, the distribution of ultra-fine reinforcement particle in even dispersion in matrix alloy, between reinforcement and matrix, there is good interface cohesion effect simultaneously, the tensile strength of material effectively improves, and plasticity is maintained preferably simultaneously.Be specifically described below by embodiment.
embodiment 1:
To prepare the intermetallic compound ultrafine grain reinforced metallic matrix composite material of weight 2Kg.
YAl 2intermetallic compound ultrafine grain strengthens Mg-14Li-Al based composites, and preparation technology is as follows:
1, according to Al content 37.76wt%, remaining as Y proportioning YAl 2alloy raw material, founding YAl at 1530 DEG C of temperature 2intermetallic compound block materials, prepares intermetallic compound ultrafine grain by high-energy ball milling method after mechanical disintegration, and wherein ultra-fine grain median size is 5 μm.
With 33.3% magnesium chips of massfraction and 66.7%YAl 2composite ball-milling 2h(YAl 2for 600g, Mg bits are 300g), obtain composite powder.
2, the composite powder after ball milling carries out pre-compacted under pressure is 20MPa condition, as the pre-briquetting of composite powder.
3, with the form of the pre-briquetting of composite powder, in Mg-Li-Al alloy molten solution, YAl is added 2ultra-fine grain, in the proportioning of alloy molten solution, Mg is 890g, Li be 224g, Al is 16g, and through stirring casting, obtaining massfraction is 30%YAl 2strengthen Mg-14Li-Al based composites.
Composite materials property test result shows, compared with matrix alloy, mechanical properties is increased to 420MPa by the 122MPa of matrix alloy, and intensity level improves more than 200%, and unit elongation is not less than 7%, and plasticity is better kept.
embodiment 2:
To prepare the matrix material of weight 2Kg.
YAl 2intermetallic compound ultrafine grain strengthens Mg-14Li-Al based composites, and preparation technology is as follows:
1, according to Al content 37.76wt%, remaining as Y proportioning YAl 2alloy raw material, founding YAl at 1530 DEG C of temperature 2intermetallic compound block materials, prepares intermetallic compound ultrafine grain by high-energy ball milling method after mechanical disintegration, and wherein ultra-fine grain median size is 0.01 μm.With the magnesium chips of massfraction 66.7% and 33.3%YAl 2powder composite ball-milling 2h(YAl 2for 20g, Mg are 40g), obtain composite powder.
2, pre-compacted: carry out pre-compacted 10min under pressure is 2MPa condition, obtains the pre-briquetting of composite powder.
3, in Mg-Li-Al alloy molten solution, add the pre-briquetting of composite powder, in the proportioning of alloy molten solution, Mg is 1643g, Li be 277.2g, Al is 19.8g, and through stirring casting, obtaining massfraction is 1%YAl 2strengthen Mg-14Li-Al based composites.
Composite materials property test result shows, the mechanical properties of metal-base composites is increased to 320MPa by the 122MPa of matrix alloy, tensile strength values improves more than 160%, and unit elongation is down to 18% by 20% of matrix alloy, and plasticity is better kept.As shown in Figure 3 and Figure 4, in the microstructure of matrix material, YAl 2particle is distributed in intracrystalline and grain boundaries more uniformly, does not reunite, and composite material interface is characterized as perfectly directly bonding interface, does not have surface reaction and interfacial detachment phenomenon.As shown in Figure 5, the composite powder transmission pattern picture after ball milling shows, YAl 2particle is well coated by Mg, has good interface cohesion between the two.
embodiment 3:
To prepare the matrix material of weight 2Kg.
YAl 2intermetallic compound ultrafine grain strengthens Mg-14Li-Al based composites, and preparation technology is as follows:
1, according to Al content 37.76wt%, remaining as Y proportioning YAl 2alloy raw material, founding YAl at 1530 DEG C of temperature 2intermetallic compound block materials, prepares intermetallic compound ultrafine grain by high-energy ball milling method after mechanical disintegration, and wherein ultra-fine grain median size is 0.1 μm.With the magnesium chips of massfraction 66.7% and 33.3%YAl 2powder composite ball-milling 2h(YAl 2for 20g, Mg are 40g), obtain composite powder.
2, pre-compacted: carry out pre-compacted 10min under pressure is 2MPa condition, obtains the pre-briquetting of composite powder.
3, in Mg-Li-Al alloy molten solution, add the pre-briquetting of composite powder, in the proportioning of alloy molten solution, Mg is 1643g, Li be 277.2g, Al is 19.8g, and through stirring casting, obtaining massfraction is 1%YAl 2strengthen Mg-14Li-Al based composites.
Composite materials property test result shows, the mechanical properties of metal-base composites is increased to 270MPa by the 122MPa of matrix alloy, tensile strength values improves more than 120%, and unit elongation is down to 17% by 20% of matrix alloy, and plasticity is better kept.
embodiment 4:
To prepare the intermetallic compound ultrafine grain reinforced metallic matrix composite material of weight 2Kg.
YAl 2intermetallic compound ultrafine grain strengthens Mg-14Li-3Al based composites, and preparation technology is as follows:
1, according to Al content 37.76wt%, remaining as Y proportioning YAl 2alloy raw material, founding YAl at 1530 DEG C of temperature 2intermetallic compound block materials, prepares intermetallic compound ultrafine grain by high-energy ball milling method after mechanical disintegration, and wherein ultra-fine grain median size is 3 μm.
With the Al of massfraction 66.7% 3mg 2powder and 33.3%YAl 2composite ball-milling 2h(YAl 2for 20g, Al 3mg 2powder is 40g), obtain composite powder.
2, the composite powder after ball milling carries out pre-compacted under pressure is 20MPa, obtains the pre-briquetting of composite powder.
3, Al is deducted 3mg 2proportioning Mg-Li-Al alloy compositions after the amount of powder element, adds the pre-briquetting of composite powder in Mg-Li-Al alloy molten solution, and in the proportioning of alloy molten solution, Mg is 1630.1g, Li is 277.2g, Al is 32.7g, and through mechanical stirring and ultrasonic agitation assisted melting, obtaining massfraction is 1%YAl 2strengthen Mg-14Li-3Al based composites.
Composite materials property test result shows, compared with matrix alloy, mechanical properties is increased to 180MPa by the 122MPa of matrix alloy, and intensity level improves 50%, and unit elongation is not less than 16%, and plasticity is better kept.
embodiment 5:
CeAl 2intermetallic compound ultrafine grain strengthens Mg-40Li based composites, and preparation technology is as follows:
1, according to Al content 27.78wt%, remaining as Ce proportioning CeAl 2alloy raw material, founding CeAl at 1500 DEG C of temperature 2intermetallic compound block materials, prepares intermetallic compound ultrafine grain by high-energy ball milling method after mechanical disintegration, and wherein ultra-fine grain median size is 1 μm.
With the magnesium chips of massfraction 25% and 75%CeAl 2composite ball-milling 2h(CeAl 2for 300g, Mg are 100g), obtain composite powder after ball milling.
2, pre-compacted: the composite powder after ball milling carries out pre-compacted under pressure is 1MPa condition, obtains the pre-briquetting of composite powder.
3, with the form of the pre-briquetting of pre-compacted composite powder, in Mg-Li alloy molten solution, CeAl is added 2ultra-fine grain, in the proportioning of alloy molten solution, Mg is 920g, Li is 680g, and through stirring casting, obtaining massfraction is 15%CeAl 2strengthen Mg-40Li based composites.
Composite materials property test result shows, mechanical properties is increased to 180MPa by the 70MPa of matrix alloy, and intensity level improves more than 150%, and unit elongation is not less than 20%.
embodiment 6:
YAl 2intermetallic compound ultrafine grain REINFORCED Al-Cu-Li based composites, preparation technology is as follows:
1, according to Al content 37.76wt%, remaining as Y proportioning YAl 2alloy raw material, founding YAl at 1530 DEG C of temperature 2intermetallic compound block materials, prepares intermetallic compound ultrafine grain by high-energy ball milling method after mechanical disintegration, and wherein ultra-fine grain median size is 0.5 μm.
With the Al of massfraction 66.7% 2cu powder and 33.3%YAl 2composite ball-milling 40h(YAl 2for 20g, Al 2cu powder is 40g), obtain composite powder.
2, pre-compacted: carry out pre-compacted to composite powder under pressure is 20MPa condition, obtains the pre-briquetting of composite powder.
3, with the form of the pre-briquetting of pre-compacted composite powder, in Al-Cu-Li-Zr-Mn alloy molten solution, YAl is added 2ultra-fine grain, in the proportioning of alloy molten solution, Al is 1873.3g, Li be 27.9g, Cu be 33.1g, Zr be 2.4g, Mn is 3.3g, and through stirring casting, obtaining massfraction is 1%YAl 2rEINFORCED Al-2.68Cu-1.41Li-0.12Zr-0.17Mn based composites.
Mechanics Performance Testing is carried out to the matrix material prepared, test result shows, mechanical properties is increased to 460MPa by the 206MPa of matrix alloy, and intensity level improves more than 120%, unit elongation is down to 15% by 17% of matrix alloy, and plasticity is well kept.
Intermetallic compound has higher specific tenacity and specific rigidity, can effectively strengthen magnesium lithium-base alloy, lithium-containing aluminum alloy and aluminium alloy as strongthener; With ceramic phase ratio, from the angle intermetallic compound of bonding action based on metallic bond, and pottery is based on covalent linkage, and therefore intermetallic compound particle and matrix alloy may have better wettability.Meanwhile, the diffusion of the elements such as Y, Ce, Al in intermetallic compound will be conducive to the wettability improving reinforced particulate and alloy substrate; The diffusion of Al element will put forward heavy alloyed intensity further, and the diffusion of the rare earth elements such as Y, Ce will contribute to refinement and rotten tissue, puies forward heavy alloyed mechanical property and Alloy Anti oxidation and creep property; The more important thing is, intermetallic compound comparatively stupalith has good plasticity, intermetallic compound particle is used for strengthening metal-base composites, be conducive to improving the Harmony of enhanced granule and basal body interface deformation under texturizing condition, to improve the retardation of material crack crack initiation and expansion, thus there is obvious advantage on Fracture of Material over-all properties improves.Adopt ultra-fine grain as after reinforcement, its mechanism and enhancement mechanism there occurs larger change, thus has increased substantially the mechanical property taking tensile strength as the material of representative.The strengthening mechanism of plain particles reinforced composite is mainly based on dynamic changes process, and ultrafine grain reinforced metallic matrix composite material greatly strengthen its dispersion-strengthened action, simultaneously, because particle attenuates, surfactivity increases, therefore the interface cohesion of itself and matrix is firm, and this will make the supporting capacity that particle themselves exert is higher.Therefore, matrix is combined with granular boundary well, dispersed particle-strengthened, and the factors such as macrostructure is even are the major causes of ultrafine grain reinforced metallic matrix composite material high strength and high-ductility.According to the qualitative similarity of rare earth element, described reinforcement can also be Sc-Al series intermetallic compound, La-Al series intermetallic compound etc., apply the matrix material that above-mentioned rare earth intermetallic compound ultra-fine grain carries out strengthening preparation, there is excellent mechanical property, can be used widely in the field such as aerospace, communications and transportation.

Claims (1)

1. a YAl 2intermetallic compound ultrafine grain strengthens the preparation method of Mg-14Li-Al based composites, it is characterized in that: comprise the steps:
The first step, according to Al content 37.76wt%, remaining as Y proportioning YAl 2alloy raw material, founding YAl at 1530 DEG C of temperature 2intermetallic compound block materials, prepares intermetallic compound ultrafine grain by high-energy ball milling method after mechanical disintegration, and wherein ultra-fine grain median size is 0.01 ~ 0.1 μm; With the magnesium chips of massfraction 66.7% and 33.3%YAl 2powder composite ball-milling 2h, YAl 2for 20g, Mg are 40g, obtain composite powder;
Second step, pre-compacted: carry out pre-compacted 10min under pressure is 2MPa condition, obtains the pre-briquetting of composite powder;
3rd step, adds the pre-briquetting of composite powder in Mg-Li-Al alloy molten solution, and in the proportioning of alloy molten solution, Mg is 1643g, Li be 277.2g, Al is 19.8g, and through stirring casting, obtaining massfraction is 1%YAl 2strengthen Mg-14Li-Al based composites.
CN201210414648.4A 2012-10-25 2012-10-25 Intermetallic compound ultrafine particle reinforced metal-based composite material and preparation method thereof Expired - Fee Related CN102912159B (en)

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CN201210414648.4A CN102912159B (en) 2012-10-25 2012-10-25 Intermetallic compound ultrafine particle reinforced metal-based composite material and preparation method thereof
US14/375,034 US9869006B2 (en) 2012-10-25 2013-05-31 Intermetallic compound ultrafine particle reinforced metal-based composite material and preparation method thereof
PCT/CN2013/076529 WO2014063492A1 (en) 2012-10-25 2013-05-31 Intermetallic compound ultrafine particle reinforced metal-based composite material and preparation method thereof

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